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ISRN Environmental Chemistry
Volume 2013 (2013), Article ID 319178, 8 pages
http://dx.doi.org/10.1155/2013/319178
Research Article

Photocatalysis of the Organophosphorus Fenamiphos: Insight into the Degradation Mechanism

1Université Hassan 1er, Laboratoire des Sciences de l’Environnement et du Développement, Equipe de Chimie Ecologique, FST de Settat, 26000 Settat, Morocco
2Equipe de Chimie Analytique et Environnement (ECAE), Faculté Polydisciplinaire, Université Cadi Ayyad, BP 4162, 46000 Safi, Morocco
3CNRS, UMR 6296, Institut de Chimie de Clermont Ferrand (ICCF), Équipe Photochimie, BP 80026, 63171 Aubière, France
4Clermont Université, Université Blaise Pascal, Institut de Chimie de Clermont Ferrand (ICCF), BP 80026, 63171 Aubière, France

Received 25 February 2013; Accepted 1 April 2013

Academic Editors: D. Petruzzelli and H. Zhao

Copyright © 2013 H. Mountacer et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The photocatalytic degradation of the organophosphorus fenamiphos (FN) was studied using titanium dioxide as a photocatalyst and 365 nm as an excitation wavelength. Under our experimental conditions and in aerated solutions, the irradiation in the presence of TiO2 P25 (1.0 g L−1) permitted the evaluation of the half lifetime to 9.5 minutes. Laser flash photolysis experiments showed the formation of an initial species owing to the attack of the hydroxyl radical on FN. It was identified as the adduct -FN. The second order rate constant for its formation was evaluated to  moL−1 L s−1. All the products are formed via the formation of such transient intermediate. They were identified by means of HPLC/MS using electrospray in positive mode ( ). Two main processes are responsible for FN photocatalytic transformation: (i) hydroxylation on the aromatic structure and (ii) the scission of the C–O bond. A mechanistic scheme was proposed for the photocatalytic process of FN using titanium dioxide. An efficient mineralization was observed within 24 hours by using a suntest setup.